Band-sawing and jig-sawing machine



July l, 1930- c. E. SQLNBERGER 1,769,656

BAND SWING' m15 lJIG swINGzMAcHINE n l P iedmgrch 11, ,1929 Y2. sheets-sheet 1 y I y U I l I Z? ,afa wfg-f3 l r In l Q40. y zo ATTO EY July l, 1930. c. E. suLLENBERGER BAND .SAWING AND JIG SAWING MACHINE Filed March l1, 1929 2 Sheets-Sheet 2 @sa /enfjP/t INVENTOR 20 ATTO EY Patented July' l, l1930 CHARLES n SULLENBERGER, or DALLAS, TEXAS BAND-SAWING AND J'IG-SAWING MACHINE Application led March 11, 1929. Serial No. 345.978.'

This invention relates to sawing machines, and more its primary object the provlsion of a combination band sawing and jigksawing machine. l j

The present invention is an improvement over my Patent 1,757,785, granted May 6, 1930, and wherein there are included. cer-` tainl very important additions andalterations.

One of the important features of this present invention is the addition of certain parts, whereby' the machine may be converted from a band sawing machine to a jig sawing machine, such change capable of'being made in a few minutes. l

Another very important feature of this invention is the improved automatic safety brake means, whereby the machine is automatically stopped in the event a saw blade should be broken.

A further object of the invention is that by its construction and arran ement, two operators can use the same mac ine and the same saw blade and perform simultaneously two separate and distinct kinds of work and without interfering with each other.

Other minor yet important objects of the invention will become apparent from a pe-4 '30 rusal of the following description, taken 1n connection with the accompanying drawings and wherein: ,j l

Figurel is a side elevational view of the machine, with the jig saw in operable posi- A tion, Q I Figure 2 is a top plan view partly in horlzontal section,

Figure 3 is a view similar to Figure 1, but

illustrating parts removed in the installation of the band saw, l

Figure 4 is an enlarged detail sectional view of Figure l, the View taken on the line 4-4'thereof,

vFfgure 5 is a detail view-of thesupporting i member for the reciprocating element which operates the jig saw attachment, and l Figure 6 is an enlarged detail view in transverse vertical section of the adjustable saw carrier.

6'0 Proceeding in accordance with the drawparticularly the invention has` forv ings wherein numeralsV are-used to show the substantially C-shape frame for the mechamsm. Thev upper portion 11 of the frame is formed with the verticalextension 12 within which the carrier wheel 13 for'the saw 14 is adjustably mountedv in any preferred manner, for inst-ance, the screw 15. A block 16, upon which the wheel 13 is mounted, is loosely'supported'on the smooth end of the screw 15. A nut 17 is also threadedly engaged with the screw 15 for moving the block 16 by turning the small wheel 18 in tightening the saw in operable position.

Interposed between the nut 7 and block 16 is a spring 19 which is provided for the by means vof.,l

various parts of themachine, 10 indicates apurpose of automatically shutting olil the motive power through the member 2O and cof acting parts,

hereinafter more particularly referred to.

The-forward extension 23 'at the-'lowerv portion of the .f adjustable work portion 26 of extension 23. The table has rame is provided with antable 24, with an' arcuate-f" mounting 25, disposed within a bifurcated a saw slot 27, and may be adjusted bythe 'j link 29, post 30 and screw 31.

The open frame 10 of the saw is also provided with a fixed table 34;

adjacent' its base a carrierwheel 37, while a similar wheel 38 is'journaled atthe rear of f8() The portion 23 of the framehas journaled substantially a two-wheel saw support, and theirarrangement prevents excessive stra-1n on the saws.-

Co-operating with the lower reachf41 of thesaw, there is providedl a miter box or work holder 42, having its angularly. disposed walls-slott'ed as: at 43, for the passa of the saw blade.

mounted at 44 upon a post or standard 45 and heldin adjustable position by cla-m' I screw 46. The post 45 isalso vertically ad This box is pivots. y I

.m members 49 held in position by the screws frame 1oand straps are removedby unscrewin instable in the bracket 47 and held by the screw. 48.

The foregoing describes parts of the machine covered in the former application for United States Letters Patent and is repeated for the sake of clearness in obtainin a correct understanding of the improve parts which will now be given in detail.

llihe machine can be converted into a jig saw' by an attachment comprising'the clamp 50. To each clamp member is fastened a n strap 51 and the jig saw 52 is fastened to the straps b the members 53 and artially tightens by the turnbuckle 54. T e screw is afterwards rotated to procure the complete tightening-desired before the 'saw is set` in operation. A set screw is ad vanced into the blockto tighten the parts when the machine is used as a jig saw.

y'Ihejig saw is made to reciprocate vertically by means of the levers 56 and57 pivoted to the wheels 13 and 37.

Inrig'nre 1 it will be geen that the inner.

ends of these levers 56 and 57 are pivoted to opposite sides of a. reciprocating element consistin of a link 58 which has T-shaped ends 59. hese end'p'ortions of the link are seated to .slide backwards and forwards in slots 60 ber 61.

' The supplorting member is secured to the y the; bolts 62, being inserted through the apertures 63 in the angular projection 64 of the member 61. In the link 58 is provided a slot 64 for the purpose of connecting the motive ower to reciprocate the link in the thrust an pull of the levers to rotate the wheels 13 and 37.

-It will be seen fromFigure 1 that to the rear of the link there is a gear 65 mounted on a shaft 67 the ear in mesh with adrive gear 66. Gear 66 is carried on shaft 66 and the shaft- 67' is journalled in frame 61. A pin 67 Vis eccentrically mounted on gear 65. Obviously, when the motor is in motion, the gear 65,`by means of its pin 67, bearing against the sides of the slot 64, will. cause the member 58 to move to the ri ht and left.

.Thus through the levers 56 and 5 the wheels 13 and 37 carrying' the jig sawwillvertically reciprocate the saw.

In Fi re 3 is shown' the appearance of the mac ine with the jig saw attachment removed and the band saw inoperableposition. For this change it is onl necessary to remove gear support 61 with t e reciprocating element and gear 65. The jig saw i312 t e clamps-49, and the levers 56 and 57 aken oi. The band saw 14 is then put in position around the wheels including the wheel 38 and tightened to operable position by the screw 15.

The machine includes an improved means necte provided in the supporting mem` ping immediately the mechanism. This arrangement comprises a wei ht 68 and cable 69 in connection with a kni e switch 70. In addition there is provided a supporting leg 71, pulley 72, rod 73, and sleeve 70. The sleeve, pulle and rod are rigid one with the other, the s eeve being loosely mounted on the shaft 70 and connected to the supporting leg 71.l The switch 70 is pivotally conat one end to the member 20 previousl mentioned. The switch is connected in, t e electrical circuit wires supplying power for the motor.

This automatic power shut-oi operates as follows: When either of the sawsare in operable osition and the screw 15 rotated, the nut 17 caring against the spring 19, moves the block 16 -and wheel 13 to required height to ti hten the saw. However, the tightenlng of t e saw will not force the block high enough to throw the switch, but if for any reason the saw should break, the sprn being under compression by the pull o the saw blade, will, should the latter part, move the block high enough to cause the member .2() to raise oneend of the knife switch 70,

whereupon the end 75 of the switch moves out of contact with the rod 73, and the rod 73 is moved upward by the pull of the weight 68. The pulley 72 is held against rotation by the rod 73, bearing against switch 70.

Asr the weight drops downwardly the cable 69 exerts a pull upon the brake member 76 on each of the wheels and stops the momentum thereof, the motive power having' been previously cut off by the opening of the switch.

The operation of the machine will now jig saw attachment, lit is believed, without further e lanation. A

While t e details'of construction for a practical operating embodiment of the invention are here shown, the invention is not restrictedv to such disclosure minutely, as considerable alterations and changes are possible in keeping with the appended claims. i

What is claimed as new is:

1. In a device of the character described, in combination -with band saw pulleys, an electric motor for producing movement of -said lpulleys to actuate the saw, normally in .cperative brake means, means for tensioning the saw, a normallyI closed switch for said motor associated with said tensioning means and actuated on .the breaking of the saw to open and cut .oi said motor, said brake means being automatically actuated by the openin of said vswitch to retard said 'be apparent for either the band saw or the mil pulle s, w ereby the momentum of the 4 whee is stopped at the same time the motor iscut oil.

lao

2. In a device of the character described, in combination with saw conveying pulleys, a motor for producing movement of the pulleys to actuate the saw, a normally closed switch'for controlling said motor, brake means for said pulleys held inoperative by said switch when in closed position, tensioning means for said saw, and means associated with said tensioning means and said switch for actuating said switch to automatically shut off said motor when a saw breaks, the said brake means for said pulleys being rendered operative on the actuation of said switch.

3. The combination with a band saw niachine which includes three band saw pulleys, one of which is power driven, of means for converting the band saw machine into a jig saw machine, said means including a jig saw, means for supporting said jig saw from two of the band saw pulleys, gearing operated from the power driven pulley, a reciprocating cross head actuated by said gearing, and links extending from said cross head to each of the pulleys to which the jig saw is attached and eccentrically connected to said pulleys, whereby reciprocation of the saw is obtained on rotation of said power driven pulley.

4. The combination with a band saw machine which includes a main frame and three band saw pulleys, one of which is power driven, of means for converting the band saw machine into a jig saw machine, said means including a jig saw, means for supporting said jig saw om two of the band saw pulleys, an auxiliary frame detachably connected to the main frame adjacent the power driven pulley, a rotating element carried by said auxiliary frame operated from said power driven pulley, and carrying an eccentric, a cross head slidingly mounted in said .auxiliary frame and operated by said eccentric, and links extending from said cross head to each of the u1- leys to which the jig saw is attached an eccentrically connected to said pulleys, whereby reciprocation of the saw is obtained in rotation of said power driven pulley. i

5. In combination with a band saw machine, which includes three band saw pul- 4 leys, one of which is power driven, of means for converting the band saw machineinto a jig saw machine, said means including a.

reciprocating cross head separated by said power driven pulley, a jig saw, means for supporting said jig saw from two of the band saw pulleys, and links eccentrically mounted on and extending from the jig saw carrying pulleys to the cross head for producing reciprocation of said band saw. g 6. The combination with a band saw machine which includes three band saw pulleys, one of which is power driven, of means for converting the band saw machine into said means including aioo 

